My pair were conditioned for quite a while, in a divided tank together. I then put Teqs into my breeding tank for 5 days, whilst I carried on the conditioning of both. On the Friday (day 5), I gave them both a load of blood worm, gave them an hour or two to settle after their big feed then did an 80% water change in my breeding tank. Added new IAL and put the girl in her chimney (I actually floated a clear plastic tub type thing half in the water, half out). I left them like this over night, released her in the morning at about 11, jarred her up again at about 3. Released on Sunday (day 7) at about 9 and they were spawning at 11.
If you don't feed at all, the pair will feast on the eggs and him on the babies. Equally you want to clean the tank as close to their spawning as possible so you don't need to do it again until the babies are well established in the tank.
If you need to do a water change, jar your girl up and place her next to the tank, so they can still see each other. Give them a good feed on blood worms if possible then do a water change in the tank. Get the water you add to as close to 28'c as you can, before putting it in the tank, as you don't want to throw him off. Add some IAL. Once done, put her and her jar back into the tank for the rest of today and release her in the morning. This would be my plan of action if I were in your boots.
Hope that helps.